精炼渣中w((CaO))/w((Al_(2)O_(3)))对钢液脱硫的影响  

Effect of w((CaO))/w((Al_(2)O_(3)))in refining slag on steel desulfurization

作　　者：陈国俊 刘晓峰 王举金 陈露涛 任英[4] 包广团 张立峰 CHEN Guojun;LIU Xiaofeng;WANG Jujin;CHEN Lutao;REN Ying;BAO Guangtuan;ZHANG Lifeng(School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China;Steelmaking Plant,Chongqing Iron and Steel Company Limited,Chongqing 401258,China;School of Mechanical and Material Engineering,North China University of Technology,Beijing 100144,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819 [2]重庆钢铁股份有限公司炼钢厂,重庆401258 [3]北方工业大学机械与材料工程学院,北京100144 [4]北京科技大学冶金与生态工程学院,北京100083

出　　处：《钢铁》2025年第3期78-85,94,共9页Iron and Steel

基　　金：国家重点研发计划资助项目(2023YFB3709900);国家自然科学基金资助项目(U22A2017152374318)。

摘　　要：为了研究精炼过程中精炼渣w((CaO))/w((Al_(2)O_(3)))对钢液脱硫效果的影响,通过工业试验调整LF炉精炼渣中的w((CaO))/w((Al_(2)O_(3))),并分析钢中硫含量变化规律,发现与w((CaO))/w((Al_(2)O_(3)))为1.6的精炼渣脱硫效果相比较,w((CaO))/w((Al_(2)O_(3)))为2.0精炼渣的脱硫效果更好。计算了不同w((CaO))/w((Al_(2)O_(3)))的精炼渣的熔化温度、固相分数、黏度和硫容量,发现在1873 K下,当精炼渣中w((CaO))/w((Al_(2)O_(3)))大于1.8时,精炼渣由完全液相开始向半液相转变,并且精炼渣的固相分数在持续升高。此外,在硫容量CS的基础上考虑黏度对精炼渣脱硫能力的影响,提出用1个无量纲的脱硫指数(Sindex)表示精炼渣脱硫的能力。随着精炼渣中w((CaO))/w((Al_(2)O_(3)))的增加,精炼渣的黏度呈现先降低后升高的趋势,当w((CaO))/w((Al_(2)O_(3)))为1.8时,黏度η处于最低位置;随着渣中w((CaO))/w((Al_(2)O_(3)))的增加,CS值逐渐增加;随着精炼渣中w((CaO))/w((Al_(2)O_(3)))的增加,Sindex值呈现先升高后降低的趋势,当w((CaO))/w((Al_(2)O_(3)))为2.0时,脱硫指数Sindex处于最高位置,因此将渣的w((CaO))/w((Al_(2)O_(3)))控制在1.8~2.0更有利于提高渣的脱硫效率。最后,通过对1600℃下CaO-Al_(2)O_(3)-SiO_(2)-5.68%MgO四元系精炼渣的脱硫指数进行计算,在精炼渣为液相的前提下,精炼渣中w((CaO))/w((Al_(2)O_(3)))越高,渣的脱硫指数Sindex越大,钢液的脱硫效果越好。To study the effect of w((CaO))/w((Al_(2)O_(3)))in the refining slag on the molten steel during the secondary refining process,the w((CaO))/w((Al_(2)O_(3)))was adjusted through industrial trial.The change of the sulfur content in steel was analyzed.The results shows that the desulfurization ability of the refining slag with the w((CaO))/w((Al_(2)O_(3)))of 2.0 is better than that of refining slag with the w((CaO))/w((Al_(2)O_(3)))of 1.6.The melting temperature,solid phase fraction,viscosity,and sulfide capacity of the refining slag with different w((CaO))/w((Al_(2)O_(3)))are calculated.When the w((CaO))/w((Al_(2)O_(3)))in the refining slag exceeded 1.8,the refining slag transitions from the liquid phase to a semi-liquid phase,and the solid phase fraction of the refining slag increases continuously at 1873 K.The influence of viscosity kinetic factor on the desulfurization ability of slag was considered.A dimensionless desulfurization index of Sindex was proposed to represent the desulfurization ability of the refining slag.It is revealed that with the increase of w((CaO))/w((Al_(2)O_(3)))in the refining slag,the viscosity of the slag first decreases and then increases.When the w((CaO))/w((Al_(2)O_(3)))is 1.8,the viscosityηreaches a lowest level.With the increase of w((CaO))/w((Al_(2)O_(3)))in the refining slag,the sulfur capacity Cs gradually increases.With the increase of w((CaO))/w((Al_(2)O_(3)))in the refining slag,the value of Sindex first increases and then decreases.When the w((CaO))/w((Al_(2)O_(3)))of the slag is 2.0,the value of Sindex reaches a highest level.It is suggested that control the w((CaO))/w((Al_(2)O_(3)))of the slag within the 1.8 to 2.0 is more beneficial for improving the desulfurization ability of the slag.Finally,the Sindex of CaO-Al_(2)O_(3)-SiO_(2)-5.68%MgO refining slag at 1600℃was calculated.In the liquid region of the refining slag,the Sindex increases with a higher w((CaO))/w((Al_(2)O_(3)))in the refining slag,which is beneficial to improve the desulfurization efficiency of the molt

关 键 词：炉外精炼 硫容量 黏度 精炼渣 熔化温度 固相分数 脱硫效果 钢液 

分 类 号：TF7[冶金工程—钢铁冶金]